Avoid using 'make' for installing; use 'mkdir -p' for creating the directories to solve parallel install issues (Apache's script is not safe, but we expect a working mkdir -p). Tested on a 32-way system.

Bug #202748 - In setup_mpm(), initialize MY_MPM to an empty
string before entering the loop so that it still works when
setup_mpm() is called a second time during pkg_setup() of a
binary package. This is needed for compatibility with
portage-2.1.4 since the MY_MPM value from build time will
still exist at binary package installation time. Thanks to
Tais M. Hansen for <tais.hansen@osd.dk> for debugging this.

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